Yahoo Sent Items & Message Convo's

In Zimbra my Yahoo sent items only go back to the 18th of June.

I've been using this app for over a year and this yahoo account for 10 years so I'm fairly certain I've sent messages before June 18th

First I thought maybe this was just some Zimbra option but just now I checked Gmail and I had sent items going back to '07. So this is something specific with Yahoo. Does anyone have any ideas?
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My second problem, yahoo again lol

It's not showing me messages in "conversation mode" or whatever you call it like this screenshot from my Gmail account in Zimbra.

I was sure Yahoo was doing this until a few days ago, but maybe I'm crazy?...